|
|
|
|
DNR MINERALS TEACHER EDUCATION WORKSHOP Geological Survey Faces Budget Cut You know you’re an ardent fan of geology when... WOMEN IN GEOLOGY: Inge Lehmann
DNR
MINERALS TEACHER EDUCATION WORKSHOP Aug 5-7 Annual
three-day workshop offers geology and earth-science training for K-12 teachers,
parents that home school, and other educators. It consists of one day of
classroom sessions; 1-1/2 days field trips and mining tours. Topics include
general geology, rock and mineral ID, and mine reclamation. Held in Hibbing,
$30, space is limited. Interested? Visit: <http://www.dnr.state.mn.us/education/geology/workshop/index.html>
call (651) 296-4807; e-mail vicki.hubred@dnr.state.mn.us Minnesota
Geological Survey Faces
Budget Cut as Legislature Faces Deadline The Minnesota Geological Survey is facing a
budget cut of at least 8% for the coming two years as state lawmakers enter the
final stage of wrestling with the state budget. The Legislature must adjourn on Monday, May 19,
under the Minnesota Constitution. As this newsletter goes to press, most key
budget decisions remain unresolved. The MGS is funded through the University of
Minnesota’s budget bill. The
budget request submitted to the Legislature by Gov. Tim Pawlenty included deep
cuts in funding for all higher education institutions.
Gov. Pawlenty’s recommendation cut the part of the U of M budget that
funds the Survey by 14% below the 2003 level.
This would have cut the survey by $168,710 a year for the next two years
- to $1,036,359 annually in each of the next two years. Republican lawmakers, who control the Minnesota
House of Representatives, passed a higher education budget bill that restored
some of the cuts proposed by the Governor.
Under the House bill, MGS
would lose a little less - about $150,000 per year. DFL lawmakers in the state Senate passed their
version of the higher education budget bill with $100 million more than the
Governor proposed. However, it
still cuts funding to the Survey by about $125,000 a year in each of the next
two years. Because the House and
Senate passed wildly different bills, a conference committee - which consists of
five House members and five Senators - has been appointed to negotiate a
compro-mise package that can be re-passed by both sides of the Legis-lature and
sent to the Governor’s desk. As
of May 12, no progress had been made. The budgets for the agencies that use the
Geological Survey - including the Department of Natural Resources, Pollution
Control Agency, Department of Health and others - likewise remain in limbo with
the adjournment deadline less than two weeks away.
As with the higher education budget, the House and Senate passed budget
bills with significant differences on funding and policy. Should the Legislature fail to pass a state
budget package by the constitutional adjournment deadline of May 19, two things
can happen: ·
The Governor can call lawmakers back
for a special session to continue to work toward agreement, or · If there is no special session (and only the Governor can call one), or if there is no agreement in a special session, state government would completely shut down on July 1. The state’s two-year budget cycle ends on June 30, and with no budget bills enacted, there would be no legal authority to spend money for any state government activity. President’s
Letter… Since this is the end of our lecture
series for 2002-2003, this seems to be a time for a whole lot of thank yous. First, thanks to all the wonderful
lecturers who worked so hard and taught us so much.
We’re also grateful to Rick Uthe, who put together the series on the
“Fascinating Geology of Minnesota”. We
are grateful to the Minnesota Geological Survey staff who let us use their
facility for all of our lab sessions, and who provided the geologists to deliver
13 of our lectures and labs. Where would we be without them!
(I hope we don’t soon have to find out.) Thanks to the GSM Board and members and
to former President Steve Erickson for the assistance they have given Rick in
preparing next year’s interesting
lecture series, entitled “Geologic Landscapes”. Thanks to members who serve on various
committees of the society, and to all members, whose membership fees enable us
to offer honoraria and reimbursed expenses to our speakers. Plans are well underway to make our booth
at the State Fair more attractive than it has been. Thanks to the Mattsons, long
time members who supported this financially,
and to Roger Benepe, Tom Schoenecker, and Bruce Goetteman, who are making
this plan a reality. Thanks in
advance to the people who will help by offering to staff our booth during the
fair. Doug Zbikowski continues to lead our
Public Service Committee, while Bill Farquhar has taken over the education part
of that committee. Ted Chura does
more than his fair share as he’s our treasurer, and heads our video library. Gail Marshall is no longer on the Board,
but she’s as active as before. She’s our Membership chair, and is one of the
prime organizers for our summer field trips. Please support her and her partners
in organizing: Diane Lentsch, Dick Heglund, and Steve Erickson. The three field
trips still to be held this summer should be great. After you look at our Website < www.geo.umn.edu/
orgs/gsm/>, thank Alan Smith for all he does to maintain that informative
site. Former president Bill Robbins’ wise
counsel is always helpful, and an additional thank you to Bill for preparing the
new 2003 directory. Our continued
gratitude goes to Katy Paul who prepared this newsletter, and effective with the
August edition, has turned over the editorship to Tom Smalec.
Thanks for all you’ve done Katy! I have not forgotten Judy Hamilton, our
secretary, but will say more about her when her term of service is over, at the
end of this year. I apologize in
advance to anyone whose name I omitted. If you want your name to be on a list
like this next year, or if you just want to become more involved in the work of
the society, please know that you are very welcome to join in the fun, and work.
Phone or email me or other Board members (phone numbers and emails in the
directory).
~Paul
Martin, President Vertebrate Paleontology
Complaining
About Gas Prices? By Terry Almsted, Fredericksburg TXThe price of a gallon of gas is up again. Our daily lives are so dependent upon petroleum products, and so we complain about the rising prices. I'm a native Minnesotan who, by the quirks of fate, got involved with the oil industry years ago, and thought it might be interesting to the members of the GSM just what is involved in looking for oil these days. If I was addressing an audience of people living on the Gulf Coast of the United States, this would be general knowledge, as everyone living there has a cousin, neighbor or work themselves in the oil industry. Minnesotans are a different story, the oil industry is rather a foreign subject. My experience is in one part of the oil industry,
exploration. Along with it are production, refining and transporting to the
customers, so I speak of one small part of the whole picture. It’s quite an
amazing industry, and I wish I could write of all the people involved in getting
a gallon of gas to the pumps, but here I hope to just enlighten you on the
search for oil. These days, most exploration takes place offshore.
The easy areas, dry land, have been surveyed already. The beginning of
exploration is a guess as to what might be a likely place for the right
conditions for oil to be trapped. A seismic survey ship will be hired to gather
data at the area in question. The process of determining what lies in the twenty
thousand feet of rock, sitting under a few thousand feet of water, is what
offshore exploration is all about. A seismic boat has four main divisions of
equipment: the seismic sources, the recording system, the processing system, and
navigation. All of these work together to get a picture of what's down there,
and even then, after all is said and done, it doesn't guarantee oil is there,
only that the rock formations may be capable of trapping oil. The seismic sources are typically referred to as air guns, as they release air, compressed at 2000PSI, to create a shock wave that travels down through the water, and through the rock layers. It reflects back to the surface as it encounters various faults and density changes. The guns come in different sizes, each one creating a specific frequency content in the shock wave, and they are placed out in the water in an array of up to 100 individual guns. Each gun is roughly equivalent to a stick of dynamite going off when it releases its high pressure air. Indeed, 2000PSI is capable of blowing a hole through a human body. Safety is a major concern around the guns. To gather good data, all the guns in the array must fire at the same time, i.e. within a thousandth of a second of each other. That is where I do my work. I build the electronics that control the gun timing. The guns are towed about 200 meters behind the ship, on what are called strings. At the far end of the strings, are GPS receivers, to tell the boat exactly where the guns are when they fire. Also, each string has electronic instruments to tell the operators exactly what depth in the water the guns are at, as this is critical. Large tubular floats, each about the size of a civil war cannon, and large enough to crawl through, support the guns in the water. Towed behind the guns, and extending out nearly a
quarter mile either side of the ship, and to a length of over a mile, are very
sensitive underwater microphones, called hydrophone streamers. To maintain their
position, this quarter mile out from the sides of the ship, devices called
paravanes that are like kites in the water, pull the streamers outward. The
tension on the streamers is monitored constantly, as too much or too little
indicates problems. The tension on pulling these streamers through the water is
about 2 or 3 thousand pounds each streamer.
There is so much drag from towing all this stuff through the water, that
the ship burns about 8000 gallons of diesel fuel per day.
(They're their own best customer). The shock waves generated by the
seismic guns are reflected back from deep in the ground under the water, to
these streamers of hydrophones. Then the data is converted
to an electrical signal, which is sent by cables to the recording system
on the ship.
There will be thousands of hydrophones in a single
streamer, and each streamer is valued at over $100,000.
Like the guns, they must be at a certain depth.
Too shallow, and they get too much noise from wave action; too deep, and
they get reflections from the surface that confuse the data. To maintain the
correct depth, a ”bird” is placed every so many meters along a streamer. A
bird is a cylindrical instrument that has wings that can be controlled from the
boat, to cause the streamer to dive or to rise. For the birds to work correctly,
the streamers must have near neutral buoyancy. This is accomplished by mounting
the hydrophones inside oil filled plastic tubes, the oil being lighter than
water. Every job done requires varying the amount of oil, to compensate for
differences in water temperature and salinity. At the other end of the hydrophone streamers, is a
recording system. Every time the guns fire, for five seconds, or so,
the recording system tapes the data from all the hydrophones. The amount
of data is phenomenal: gigabytes
each shot, terabytes to the max each job. Each shot requires the logging of the
GPS data of each gun string, and of course each hydrophone streamer has a GPS
receiver to be recorded. Also
recorded are depth data, air pressure on the guns, and gun timing data, should a
gun be out of time by a couple of milliseconds. In the old days, no processing was done on board
the ship. But now, with the advances made in electronics, a lot of data is
processed to a point where it can be determined that all is well with the
information being gathered. The data from each hydrophone shows up as a squiggly
line when printed, and compensation must be made for such things as its distance
from the seismic guns. The interpretation of the data is well beyond my
explanatory capabilities. The data is organized in conjunction with the
navigation of the ship. What is called a seismic line is steered by the ship,
again with help from GPS. This line is simply a course the ship follows, and may
typically be about 50 miles long. As the ship follows this line, the guns are
fired by the GPS navigation system every 50 meters, or so. At the end of a line
you may have fired the guns a few thousand times. A whole prospect survey may
encompass 50 or 100 lines to be navigated. Because the streamers are a mile or
more in length, for the ship to end one line, turn around, and come onto a new
line, requires about 4 hours, and the lines themselves are about 12 hours long.
You just can't turn around sharply, or you'll tangle your streamers. Each line
surveyed costs the client about $150,000, and since you can do 1 or 2 lines a
day, any hours lost due to a tangle in your streamers, or guns failing, or a
fishing boat crossing your streamers and cutting them off, rapidly mounts up in
the dollars category. Besides the technical people operating the seismic systems, there is the ship’s crew. They keep the boat moving, keep the technicians fed, and maintain a safe and clean environment. Everyone works 12 hours on, 12 off; heck, there isn't anyplace to go after work anyway. Its an interesting amalgam of people. For example, my last trip involved a Louisiana company-owned ship, leased by a Russian geophysical company whose technicians operated the seismic systems, with a mostly Philipino crew, and with Brits, Scots, Australians, Americans and Canadians installing the systems and teaching the operators, and the company hiring the boat was from India, so the company reps were Indian. Every-one must have respect for the others, the ship is only 300 feet long, you can't hide from the society onboard. Courtesy and honesty are rampant. The staff onboard, crew and technicians, normally stay for about 60 days, and get rotated out with a relief crew. Then its fly home for a few weeks, and back out to another job. I'm lucky, I just teach and install, usually on and off in 2 weeks, but for most, its a mighty long commute to work. I hope this makes you feel a little better next
time you fill up your tank. A lot of people, from all cultures and nationalities
had a hand in bringing this energy to you. All the easy oil has been found,
what's left is in the remote and deep areas of our planet. And don't forget the
motto of the oil industry: There's no fuel like an old fuel.♦
From the Editor: Its
been fun, but I have decided that it is time for a change, time for someone else
to take over the newsletter. Tom
Smalec has graciously agreed to do this. So
with this issue, I’ll be turning over the Editorship to him.
But don’t think that you won’t see any more articles from me in the
newsletter. Tom doesn’t know it
yet, but I plan to deluge him with articles.
And I hope that other members will do the same.
The newsletter editor’s job is very difficult when there is nothing to
publish. And a newsletter written solely by one person can get pretty
stale. So please submit articles
and ideas to Tom. The newsletter represents ALL the membership, and all the
membership can submit things for consideration. No guarantee that everything submitted can or will be used,
but it sure is great to have choices.
~Katy Paul WOMEN
IN
GEOLOGY: Inge Lehmann
Inge Lehmann (1888 – 1993) was born in Denmark, on May 13, 1888.
In 1920 she earned her master's degree in mathematics. After 12 years of
undergraduate and graduate studies at the University of Copenhagen and
University of Cambridge, studies that were interrupted by 6 years of full-time
actuarial work, she earned a second master's degree in 1928, in geodesy, from
the University of Copenhagen.
Lehmann's career in seismology began in 1925 when she aided N. E. Norlund
as he established seismic networks first in Denmark, then in Greenland. By 1928,
Lehmann was named the first chief of the seismology department of the newly
established Royal Danish Geodetic Institute, a position she held for 25 years.
In 1936 she published the paper that sealed her place in the history of
geophysics. Known simply as "P'
(P-prime)," the paper suggested a new discontinuity in the seismic
structure of the Earth, now known as the Lehmann discontinuity, a region that
divides the core into inner and outer parts. Using ray theory and travel time
curves to interpret seismograms, Lehmann discovered that the P' phase of seismic
waves traveling through the inner Earth was not the result of diffraction, the
commonly held interpretation at the time, but a clear indication of an inner
core.
Later, Lehmann established herself as an authority on the structure of
the upper mantle. Extended parts of her later years were spent as a visiting
scientist at the Lamont-Doherty Earth Observatory, Dominion Observatory, the
Seismological Laboratory at Caltech, and the University of California, at
Berkeley. She also led her colleagues as a founder and president of the European
Seismological Federation, president of the Danish Geophysical Society, and vice
president of the International Association of Seismology and Physics of the
Earth's Interior.
In 1971, Inge Lehmann was presented with the William Bowie Medal, the
American Geophysical Union's highest honor, which is granted to a scientist who
has made fundamental contributions to the study of geophysics and who has lived
up to the AGU ideal of unselfish cooperation in research. Lehmann also was named
an AGU Fellow and was awarded honorary doctorates from Columbia University and
the University of Copenhagen. ♦ ☼
☼ ☼ ☼ ☼
IT'S
STATE FAIR TIME AGAIN! ☼
☼ ☼ ☼ ☼ It’s
a little early, but think STATE FAIR. The
Show and Exhibits committee is now working on a revision to our booth at the
FAIR. We hope it will be enough of
an improvement to make your time in the booth more pleasant. In the next two months, the committee
will be putting together the roster of workers for this year’s booth.
We will need 72 people to work the booth during the fair.
The fair will be from Thursday, Aug. 21st through Monday,
Sept. 1st. Each day will
be divided into three shifts. The
shifts will be from 9 AM to 1 PM, 1 PM to 5 PM, and from 5 PM to 9 PM.
We will need two people per shift. We know that the May Newsletter may be a
little early for you to start planning, however, the August newsletter would be
too late. So why don’t you check
your schedules, pencil in a good date, and call Tom Schoenecker at
952-474-4600, and have him reserve that time (or a good substitute) for
you. HURRY BEFORE ALL THE GOOD
TIMES ARE GONE. Tom will send you a reminder before the fair starts. Remember, you don’t have to be a Geological Genius, but just have an unbridled interest in Geology, and just plain old Rocks, to work the Fair. Your job at the fair is to invite those with the same interests to our lectures and field trips. Membership will hopefully come from that. FIELD TRIP SCHEDULE – 2003June
28-29 Baraboo Area of
Wisconsin
contact Dick Heglund
Leader: Phil Fauble
Wisconsin Department of Natural Resources July
??
The Great Mississippi River Road
contact Gail Marshall
Dubuque,
Iowa to Saint Paul, Minnesota
Leader: Ian Williams,
University of Wisconsin (tentative) August
17 Geological Walking Tour
of Saint Paul
contact Steve Erickson
Guides: Science Museum of
Minnesota Geological
Society of Minnesota
Minnestoa Mineral Society Final details of each field trip will be provided to members in a mailing, approximately three weeks before the trip. Questions prior to that time may be directed to the contact person listed above. ♦
|
|
|
